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一种用于风电变流器可靠性评估的结温数值计算方法

DOI: 10.13334/j.0258-8013.pcsee.2015.11.020, PP. 2813-2821

Keywords: 可靠性评估,结温,迭代算法,电热比拟,直驱风力发电系统,IGBT

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Abstract:

以风电变流器可靠性评估为应用背景,文中提出一种结温迭代数值计算方法。基于电热比拟理论讨论了IGBT模块在一个开关周期内的结温计算方法,并通过迭代算法计算了IGBT模块的工频周期结温。以1.8MW单机直驱风力发电系统为例,将该方法与Infineon-IPOSIM电热仿真和解析方法对比。与电热仿真相比,在保证结温精度的情况下,迭代数值计算方法显著缩短了计算时间;与解析方法相比,迭代法考虑了器件的电热耦合关系,提高了结温计算精度。文中还分析了电热参数对结温计算的影响。计算结果表明,文中提出的结温迭代算法计算精度较高,计算速度快。

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